A 0.3 V rail-to-rail ultra-low-power OTA with improved bandwidth and slew rate

F Centurelli, R Della Sala, P Monsurrò, G Scotti… - Journal of Low Power …, 2021 - mdpi.com
Journal of Low Power Electronics and Applications, 2021mdpi.com
In this paper, we present a novel operational transconductance amplifier (OTA) topology
based on a dual-path body-driven input stage that exploits a body-driven current mirror-
active load and targets ultra-low-power (ULP) and ultra-low-voltage (ULV) applications, such
as IoT or biomedical devices. The proposed OTA exhibits only one high-impedance node,
and can therefore be compensated at the output stage, thus not requiring Miller
compensation. The input stage ensures rail-to-rail input common-mode range, whereas the …
In this paper, we present a novel operational transconductance amplifier (OTA) topology based on a dual-path body-driven input stage that exploits a body-driven current mirror-active load and targets ultra-low-power (ULP) and ultra-low-voltage (ULV) applications, such as IoT or biomedical devices. The proposed OTA exhibits only one high-impedance node, and can therefore be compensated at the output stage, thus not requiring Miller compensation. The input stage ensures rail-to-rail input common-mode range, whereas the gate-driven output stage ensures both a high open-loop gain and an enhanced slew rate. The proposed amplifier was designed in an STMicroelectronics 130 nm CMOS process with a nominal supply voltage of only 0.3 V, and it achieved very good values for both the small-signal and large-signal Figures of Merit. Extensive PVT (process, supply voltage, and temperature) and mismatch simulations are reported to prove the robustness of the proposed amplifier.
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